CN109001890A - A kind of width operating distance high-resolution machine visual lens - Google Patents
A kind of width operating distance high-resolution machine visual lens Download PDFInfo
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- CN109001890A CN109001890A CN201811035372.2A CN201811035372A CN109001890A CN 109001890 A CN109001890 A CN 109001890A CN 201811035372 A CN201811035372 A CN 201811035372A CN 109001890 A CN109001890 A CN 109001890A
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- 230000000007 visual effect Effects 0.000 title claims description 19
- 230000003287 optical effect Effects 0.000 claims abstract description 36
- 238000004026 adhesive bonding Methods 0.000 claims description 6
- 230000006872 improvement Effects 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 3
- 230000004069 differentiation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
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- 238000000275 quality assurance Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
Abstract
This application discloses wide operating distance high resolution vision camera lenses, it include the first lens G1, the second lens G2, the first balsaming lens group U1, the second balsaming lens group U2 and the 7th lens G7 including the focusing group GA set gradually by object end to image planes and fixed group GB, focusing group GA；The focal length of optical system, focusing group GA and fixed group GB is respectively f, fGA, fGB, the combined focal length of first lens G1, the second lens G2 and the first balsaming lens U1 are f (G1-G4), the combined focal length of second balsaming lens U2 and the 7th lens G7 is f (G5-G7), they meet relational expression: 1 < fGA/f < 1.4,3 < fGB/f < 4 respectively；2<f(G1-G4)/f<2.6；0.6 < f (G5-G7)/f < 1, the application have the characteristics that high-resolution, low distortion, also 0.1m can be supported to the operating distance of infinity.
Description
Technical field
The invention belongs to technical field of machine vision, and in particular to a kind of width operating distance high-resolution machine vision mirror
Head.
Background technique
The effect of NI Vision Builder for Automated Inspection is to measure target part using machine, judgment and detection defect etc., to subtract
Erroneous judgement when small or elimination manual operation, improves measurement accuracy and stability.Its central principle is by machine vision mirror
Head collects optical signal to camera, then converts optical signal into electric signal to image processing system, according to collected by camera
Image information carries out various operations to extract clarification of objective, and then the device action at scene is controlled according to the result of differentiation.
On the one hand, under the overall background of industrial automation, machine vision demand is growing day by day, especially electronic manufacture,
Resolving accuracy, applicable working range, optical distortion in numerous industries such as food packaging and quality assurance, to machine visual lens
It is higher and higher etc. requiring；On the other hand, as chip technology constantly improves, pixel dimension is smaller and smaller, and this requires therewith
Matched resolution of lens will further increase.However the domestic existing generally existing resolving accuracy of focusing machine visual lens is not
Enough height are unable to give full play out the performance of camera, therefore high-resolution machine are regarded when matching with the imager chip of small pixel
Feel that the research and development of camera lens are more urgent.
Summary of the invention
It is an object of the invention to: in view of the deficiencies of the prior art, and a kind of wide operating distance high-resolution machine provided
Device vision lens, the lens focus be 25mm, 0.1m can be supported to the operating distance of infinity, in addition, also have high-resolution with
The advantages of low distortion.
In order to achieve the above object, the invention adopts the following technical scheme:
A kind of width operating distance high-resolution machine visual lens, including mechanical system and be installed in the mechanical system
The optical system in portion, the optical system include the focusing group GA set gradually by object end to image planes and fixed group GB, the tune
Coke group GA include the first lens G1 set gradually by object end to image planes, the second lens G2, the third lens G3, the 4th lens G4,
5th lens G5, the 6th lens G6 and the 7th lens G7, the fixed group GB includes the 8th lens, the third lens G3 and institute
It states the 4th lens G4 gluing and forms the first balsaming lens group U1, the 5th lens G5 and the 6th lens G6 gluing and form the
Two balsaming lens group U2；The focal length of the optical system is f, and the focal length of the focusing group GA is fGA, the focal length of the fixed group
For fGB, the combined focal length of the first lens G1, the second lens G2 and the first balsaming lens U1 are f (G1-G4),
The combined focal length of the second balsaming lens U2 and the 7th lens G7 are f (G5-G7), they meet relational expression respectively: 1 <
FGA/f < 1.4,3 < fGB/f < 4；2.0<f(G1-G4)/f<2.6；0.6<f(G5-G7)/f<1.0.
As the improvement of wide operating distance high-resolution machine visual lens of the present invention, the first lens G1, institute
State the second lens G2, the third lens G3, the 4th lens G4, the 5th lens G5, the 6th lens G6, described
7th lens G7 and the 8th lens G8 is spherical mirror.
As the improvement of wide operating distance high-resolution machine visual lens of the present invention, before the first lens G1
Surface vertices meet relational expression to the distance TTL of photosensitive element and the focal length f of optical system | TTL/f | > 2.2.
As the improvement of wide operating distance high-resolution machine visual lens of the present invention, the optics of the optical system
The focal length f of rear cut-off distance BFL and optical system, meet relational expression | BFL/f | < 0.56.
As the improvement of wide operating distance high-resolution machine visual lens of the present invention, half picture of the optical system
The focal length f of high y ' and optical system, meet relational expression | y '/f | < 0.2.
It further include diaphragm as the improvement of wide operating distance high-resolution machine visual lens of the present invention, the light
Door screen is between the 4th lens G4 and the 5th lens G5.
The beneficial effects of the present invention are: realizing one kind by above structure has the characteristics that high-resolution, low distortion,
Operating distance 0.1m can be supported to infinity shape library, focal length is the machine visual lens of 25mm, and maximum imaging surface is φ
9mm, when resolution ratio is up to 230lp/mm, i.e. corresponding maximum imager chip 1/1.8 ", pixel can reach 8 mega pixels.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes a part of the invention, this hair
Bright exemplary embodiment and its explanation is used to explain the present invention, and is not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the index path of optical system in the present invention；
Fig. 3 is the MTF figure of optical system in the present invention；
Fig. 4 is the distortion curve of optical system in the present invention；
Wherein, 0- optical system；1- diaphragm.
Specific embodiment
As used some vocabulary to censure specific components in the specification and claims.Those skilled in the art answer
It is understood that hardware manufacturer may call the same component with different nouns.This specification and claims are not with name
The difference of title is as the mode for distinguishing component, but with the difference of component functionally as the criterion of differentiation.Such as logical
The "comprising" of piece specification and claim mentioned in is an open language, therefore should be construed to " include but do not limit
In "." substantially " refer within an acceptable error range, those skilled in the art can within a certain error range solve described in
Technical problem basically reaches the technical effect.
In the description of the present invention, it is to be understood that, term " on ", "lower", "front", "rear", "left", "right", level "
The orientation or positional relationship of equal instructions is to be based on the orientation or positional relationship shown in the drawings, be merely for convenience of the description present invention and
Simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation construction
And operation, therefore be not considered as limiting the invention.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be
Concrete meaning in bright.
Below in conjunction with attached drawing, invention is further described in detail, but not as a limitation of the invention.
As shown in figures 1-4, a kind of wide operating distance high-resolution machine visual lens, including mechanical system and be installed on
Optical system 0 inside the mechanical system, optical system 0 include the focusing group GA set gradually by object end to image planes and fixation
Group GB, focusing group GA includes the first lens G1 set gradually by object end to image planes, the second lens G2, the third lens G3, the 4th
Lens G4, the 5th lens G5, the 6th lens G6 and the 7th lens G7, fixed group GB include the 8th lens, the third lens G3 and the
Four lens G4 gluings form the first balsaming lens group U1, the 5th lens G5 and the 6th lens G6 gluing forms the second balsaming lens group
U2；The focal length of optical system 0 is f, and the focal length of focusing group GA is fGA, and the focal length of fixed group is fGB, and the first lens G1, second are thoroughly
The combined focal length of mirror G2 and the first balsaming lens U1 are f (G1-G4), the combined focal length of the second balsaming lens U2 and the 7th lens G7
For f (G5-G7), they meet relational expression: 1 < fGA/f < 1.4,3 < fGB/f < 4 respectively；2.0<f(G1-G4)/f<2.6；0.6<f
(G5-G7)/f<1.0。
Preferably, the first lens G1, the second lens G2, the third lens G3, the 4th lens G4, the 5th lens G5, the 6th thoroughly
Mirror G6, the 7th lens G7 and the 8th lens G8 are spherical mirror.
Preferably, the front surface vertex of the first lens G1 is full to the distance TTL of photosensitive element and the focal length f of optical system
Sufficient relational expression | TTL/f | > 2.2.
Preferably, the focal length f of the optics rear cut-off distance BFL of optical system 0 and optical system 0, meets relational expression | BFL/f | <
0.56。
Preferably, the focal length f of half image height y ' of optical system 0 and optical system, meets relational expression | y '/f | < 0.2.
It preferably, further include diaphragm 1, diaphragm 1 is between the 4th lens G4 and the 5th lens G5.
In the present embodiment, optical system data is as follows:
| Surface | Radius (mm) | Thickness (mm) | Refractive index |
| G1 front surface | 32.0 | 1.2 | 1.92 |
| G1 rear surface | 18.5 | 10.4 | |
| G2 front surface | 23.0 | 3.1 | 1.85 |
| G2 rear surface | -297.0 | 5.0 | |
| U1 front surface | 15.0 | 5.4 | 1.76 |
| U1 cemented surface | -23.0 | 1.5 | 1.78 |
| U1 rear surface | 9.0 | 4.0 | |
| Diaphragm | 3.9 | ||
| U2 front surface | -8.0 | 1.2 | 1.73 |
| U2 cemented surface | 32.5 | 2.7 | 1.70 |
| U3 rear surface | -11.5 | 0.1 | |
| G7 front surface | 80.5 | 1.9 | 2.00 |
| G7 rear surface | -29.0 | 2.8 (adjustable) | |
| G8 front surface | 65.0 | 1.4 | 1.76 |
| G8 rear surface | It is infinitely great | 13.3 | |
| Image planes |
In this example, the focal length f of optical system is 25mm, focusing group focal length fGA=-29mm, fixed group focal length fGB=
85mm, combined focal length f (G1-G4)=57mm of the first lens, the second lens and the first balsaming lens, the second balsaming lens,
Distance TTL=of the front surface vertex of combined focal length f (G5-G7)=20.5mm of seven lens, the first lens G1 to photosensitive element
58.8mm when 0.5m (operating distance be), optics rear cut-off distance BFL=13.3mm, half image height y '=4.5mm, each relational expression:
FGA/f=1.16；FGB/f=3.4；F (G1-G4)/f=2.28；F (G5-G7)/f=0.82；TTL/f=2.35；BFL/f=
0.53；Y '/f=0.18 is all satisfied relational expression: 1 < fGA/f < 1.4；3 < fGB/f < 4,2.0 < f (G1-G4)/f < 2.6；0.6<f
(G5-G7)/f<1.0。
Fig. 3 show MTF curve figure of the present embodiment in operating distance 0.5m, full filed 230lp/mm mtf value >
0.3, theoretical resolution precision realizes the high-resolution imaging of optical system up to 2.2 microns.
Fig. 4 be wavelength 541nm optical distortion curve graph of the present embodiment in operating distance 0.5m, full filed distortion <
0.12%.
Realizing one kind by above structure has the characteristics that high-resolution, low distortion, and operating distance 0.1m can be supported to arrive
Infinity shape library, focal length are the machine visual lens of 25mm, and maximum imaging surface is φ 9mm, and resolution ratio is up to 230lp/
When mm, i.e. corresponding maximum imager chip 1/1.8 ", pixel can reach 8 mega pixels.
Several preferred embodiments of the invention have shown and described in above description, but as previously described, it should be understood that this hair
It is bright to be not limited to forms disclosed herein, it is not to be taken as the exclusion to other embodiments, and can be used for various other
Combination, modification and environment, and can within that scope of the inventive concept describe herein, by the technology of above-mentioned introduction or related fields or
Knowledge is modified.And changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, then it all should be
In the protection scope of appended claims of the present invention.
Claims (6)
1. a kind of width operating distance high-resolution machine visual lens, it is characterised in that: including mechanical system and be installed on described
Optical system (0) inside mechanical system, the optical system (0) include the focusing group GA that is set gradually by object end to image planes and
Fixed group GB, the focusing group GA includes the first lens G1 set gradually by object end to image planes, the second lens G2, the third lens
G3, the 4th lens G4, the 5th lens G5, the 6th lens G6 and the 7th lens G7, the fixed group GB includes the 8th lens, described
The third lens G3 and the 4th lens G4 gluing form the first balsaming lens group U1, the 5th lens G5 and the described 6th thoroughly
Mirror G6 gluing forms the second balsaming lens group U2；The focal length of the optical system (0) is f, and the focal length of the focusing group GA is
FGA, the focal length of the fixed group are fGB, the first lens G1, the second lens G2 and the first balsaming lens U1's
Combined focal length is f (G1-G4), and the combined focal length of the second balsaming lens U2 and the 7th lens G7 are f (G5-G7), it
Meet relational expression: 1 < fGA/f < 1.4,3 < fGB/f < 4 respectively；2.0<f(G1-G4)/f<2.6；0.6<f(G5-G7)/f<1.0.
2. width operating distance high-resolution machine visual lens according to claim 1, it is characterised in that: described first thoroughly
Mirror G1, the second lens G2, the third lens G3, the 4th lens G4, the 5th lens G5, the 6th lens
G6, the 7th lens G7 and the 8th lens G8 are spherical mirror.
3. width operating distance high-resolution machine visual lens according to claim 1, it is characterised in that: described first thoroughly
The front surface vertex of mirror G1 meets relational expression to the distance TTL of photosensitive element and the focal length f of optical system | TTL/f | > 2.2.
4. width operating distance high-resolution machine visual lens according to claim 1, it is characterised in that: the optical system
Unite the optics rear cut-off distance BFL of (0) and the focal length f of optical system (0), meets relational expression | BFL/f | < 0.56.
5. width operating distance high-resolution machine visual lens according to claim 1, it is characterised in that: the optical system
Unite the half image height y ' of (0) and the focal length f of optical system, meets relational expression | y '/f | < 0.2.
6. width operating distance high-resolution machine visual lens according to claim 1, it is characterised in that: further include diaphragm
(1), the diaphragm (1) is between the 4th lens G4 and the 5th lens G5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811035372.2A CN109001890A (en) | 2018-09-06 | 2018-09-06 | A kind of width operating distance high-resolution machine visual lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811035372.2A CN109001890A (en) | 2018-09-06 | 2018-09-06 | A kind of width operating distance high-resolution machine visual lens |
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Cited By (2)
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| CN109683282A (en) * | 2019-01-17 | 2019-04-26 | 广东奥普特科技股份有限公司 | The low distortion wide-angle fixed-focus line of one kind sweeps machine visual lens optical system |
| CN113820828A (en) * | 2021-10-09 | 2021-12-21 | 广东奥普特科技股份有限公司 | High-resolution fixed-focus lens |
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